﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;

public class XmlHelper
{
    #region 增、删、改操作==============================================

    /// <summary>
    /// 追加节点
    /// </summary>
    /// <param name="filePath">XML文档绝对路径</param>
    /// <param name="xPath">范例: @"Skill/First/SkillItem"</param>
    /// <param name="xmlNode">XmlNode节点</param>
    /// <returns></returns>
    public static bool AppendChild(string filePath, string xPath, XmlNode xmlNode)
    {
        try
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(filePath);
            XmlNode xn = doc.SelectSingleNode(xPath);
            XmlNode n = doc.ImportNode(xmlNode, true);
            xn.AppendChild(n);
            doc.Save(filePath);
            return true;
        }
        catch
        {
            return false;
        }
    }

    /// <summary>
    /// 从XML文档中读取节点追加到另一个XML文档中
    /// </summary>
    /// <param name="filePath">需要读取的XML文档绝对路径</param>
    /// <param name="xPath">范例: @"Skill/First/SkillItem"</param>
    /// <param name="toFilePath">被追加节点的XML文档绝对路径</param>
    /// <param name="toXPath">范例: @"Skill/First/SkillItem"</param>
    /// <returns></returns>
    public static bool AppendChild(string filePath, string xPath, string toFilePath, string toXPath)
    {
        try
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(toFilePath);
            XmlNode xn = doc.SelectSingleNode(toXPath);

            XmlNodeList xnList = ReadNodes(filePath, xPath);
            if (xnList != null)
            {
                foreach (XmlElement xe in xnList)
                {
                    XmlNode n = doc.ImportNode(xe, true);
                    xn.AppendChild(n);
                }
                doc.Save(toFilePath);
            }
            return true;
        }
        catch
        {
            return false;
        }
    }

    /// <summary>
    /// 修改节点的InnerText的值
    /// </summary>
    /// <param name="filePath">XML文件绝对路径</param>
    /// <param name="xPath">范例: @"Skill/First/SkillItem"</param>
    /// <param name="value">节点的值</param>
    /// <returns></returns>
    public static bool UpdateNodeInnerText(string filePath, string xPath, string value)
    {
        try
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(filePath);
            XmlNode xn = doc.SelectSingleNode(xPath);
            XmlElement xe = (XmlElement)xn;
            xe.InnerText = value;
            doc.Save(filePath);
        }
        catch
        {
            return false;
        }
        return true;
    }

    /// <summary>
    /// 读取XML文档
    /// </summary>
    /// <param name="filePath">XML文件绝对路径</param>
    /// <returns></returns>
    public static XmlDocument LoadXmlDoc(string filePath)
    {
        try
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(filePath);
            return doc;
        }
        catch
        {
            return null;
        }
    }
    #endregion 增、删、改操作

    #region 扩展方法===================================================
    /// <summary>
    /// 读取XML的所有子节点
    /// </summary>
    /// <param name="filePath">XML文件绝对路径</param>
    /// <param name="xPath">范例: @"Skill/First/SkillItem"</param>
    /// <returns></returns>
    public static XmlNodeList ReadNodes(string filePath, string xPath)
    {
        try
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(filePath);
            XmlNode xn = doc.SelectSingleNode(xPath);
            XmlNodeList xnList = xn.ChildNodes;  //得到该节点的子节点
            return xnList;
        }
        catch
        {
            return null;
        }
    }

    #endregion 扩展方法
}